Imperial College London
Alternate

PROFESSOR CHARLOTTE K. WILLIAMS

Faculty of Natural Sciences, Department of Chemistry

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 5790c.k.williams Website

 
 
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Location

 

317 RCS1ChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

163 results found

Romain C, Thevenon A, Saini PK, Williams CKet al., 2016, Dinuclear Metal Complex-Mediated Formation of CO2-Based Polycarbonates, CARBON DIOXIDE AND ORGANOMETALLICS, Editors: Lu, Publisher: SPRINGER-VERLAG BERLIN, Pages: 101-141, ISBN: 978-3-319-22077-2

BOOK CHAPTER

, 2016, Inside Cover: Dizinc Lactide Polymerization Catalysts: Hyperactivity by Control of Ligand Conformation and Metallic Cooperativity (Angew. Chem. Int. Ed. 30/2016), Angewandte Chemie - International Edition, Vol: 55, ISSN: 1433-7851

JOURNAL ARTICLE

Garcia-Trenco A, White ER, Shaffer MSP, Williams CKet al., 2016, A one-step Cu/ZnO quasi-homogeneous catalyst for DME production from syn-gas, CATALYSIS SCIENCE & TECHNOLOGY, Vol: 6, Pages: 4389-4397, ISSN: 2044-4753

JOURNAL ARTICLE

Myers D, Cyriac A, Williams CK, 2016, Polymer synthesis: To react the impossible ring., Nat Chem, Vol: 8, Pages: 3-4

JOURNAL ARTICLE

Thevenon A, Garden JA, White AJP, Williams CKet al., 2015, Dinuclear Zinc Salen Catalysts for the Ring Opening Copolymerization of Epoxides and Carbon Dioxide or Anhydrides, INORGANIC CHEMISTRY, Vol: 54, Pages: 11906-11915, ISSN: 0020-1669

JOURNAL ARTICLE

Romain C, Bennington MS, White AJP, Williams CK, Brooker Set al., 2015, Macrocyclic Dizinc(II) Alkyl and Alkoxide Complexes: Reversible CO2 Uptake and Polymerization Catalysis Testing, INORGANIC CHEMISTRY, Vol: 54, Pages: 11842-11851, ISSN: 0020-1669

JOURNAL ARTICLE

Garden JA, Saini PK, Williams CK, 2015, Greater than the Sum of Its Parts: A Heterodinuclear Polymerization Catalyst, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 137, Pages: 15078-15081, ISSN: 0002-7863

JOURNAL ARTICLE

Zhu Y, Romain C, Williams CK, 2015, Selective Polymerization Catalysis: Controlling the Metal Chain End Group to Prepare Block Copolyesters, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 137, Pages: 12179-12182, ISSN: 0002-7863

JOURNAL ARTICLE

Paul S, Romain C, Shaw J, Williams CKet al., 2015, Sequence Selective Polymerization Catalysis: A New Route to ABA Block Copoly(ester-b-carbonate-b-ester), MACROMOLECULES, Vol: 48, Pages: 6047-6056, ISSN: 0024-9297

JOURNAL ARTICLE

Zhu Y, Romain C, Williams C, 2015, Chemoselective polymerization: From multicomponent feedstocks to sequence controlled block copolyesters, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Zhu Y, Williams CK, 2015, Biodegradable thermoplastic elastomer from multi-block copolyester

PATENT

Brown NJ, Garcia-Trenco A, Weiner J, White ER, Allinson M, Chen Y, Wells PP, Gibson EK, Hellgardt K, Shaffer MSP, Williams CKet al., 2015, From Organometallic Zinc and Copper Complexes to Highly Active Colloidal Catalysts for the Conversion of CO2 to Methanol, ACS CATALYSIS, Vol: 5, Pages: 2895-2902, ISSN: 2155-5435

JOURNAL ARTICLE

Zhu Y, Romain C, Poirier V, Williams CKet al., 2015, Influences of a Dizinc Catalyst and Bifunctional Chain Transfer Agents on the Polymer Architecture in the Ring-Opening Polymerization of epsilon-Caprolactone, Macromolecules, Vol: 48, Pages: 2407-2416, ISSN: 0024-9297

The polymerization of ε-caprolactone is reported using various bifunctional chain transfer agents and a dizinc catalyst. Conventionally, it is assumed that using a bifunctional chain transfer agent (CTA), polymerization will be initiated from both functional groups; however, in this study this assumption is not always substantiated. The different architectures and microstructures of poly(ε-caprolactone) samples (PCL) are compared using a series of bifunctional and monofunctional alcohols as the chain transfer agents, including trans-1,2-cyclohexanediol (CHD), ethylene glycol (EG), 1,2-propanediol (PD), poly(ethylene glycol) (PEG), 2-methyl-1,3-propanediol (MPD), 1-hexanol, 2-hexanol, and 2-methyl-2-pentanol. A mixture of two architectures is observed when diols containing secondary hydroxyls are used, such as cyclohexanediol or propanediol; there are chains that are both chain-extended and chain-terminated by the diol. These findings indicate that not all secondary hydroxyl groups initiate polymerization. In contrast, chain transfer agents containing only primary hydroxyl groups in environments without steric hindrance afford polymer chains of a single chain extended architecture, whereby polymer chains are initiated from both hydroxyl groups on the diol. Kinetic analyses of the polymerizations indicate that the propagation rate constant (kp) is significantly higher than the initiation rate constant (ki): kp/ki > 5. A kinetic study conducted using a series of monofunctional chain transfer agents shows that the initiation rate, ki, is dependent on the nature of the hydroxyl group, with the rates decreasing in the order ki(primary) > ki(secondary) > ki(tertiary). It is proposed that two polymer architectures are present as a consequence of slow rates of initiation from the secondary hydroxyl groups, on the diol, compared to propagation which occurs from a primary hydroxyl group. In addition to the reactivity differences of the alcohols, steric

JOURNAL ARTICLE

Bakewell C, Fateh-Iravani G, Beh D, Myers D, Tabthong S, Hormnirun P, White AJ, Long N, Williams CKet al., 2015, Comparing a series of 8-quinolinolato complexes of aluminium, titanium and zinc as initiators for the ring-opening polymerization of rac-lactide., Dalton Transactions, Vol: 44, ISSN: 1477-9226

The preparation and characterization of a series of 8-hydroxyquinoline ligands and their complexes with Ti(iv), Al(iii) and Zn(ii) centres is presented. The complexes are characterized using NMR spectroscopy, elemental analysis and, in some cases, by single crystal X-ray diffraction experiments. The complexes are compared as initiators for the ring-opening polymerization of racemic-lactide; all the complexes show moderate/good rates and high levels of polymerization control. In the case of the titanium or aluminium complexes, moderate iso-selectivity is observed (Pi = 0.75), whereas in the case of the zinc complexes, moderate hetero-selectivity is observed (Ps = 0.70).

JOURNAL ARTICLE

Noimark S, Weiner J, Noor N, Allan E, Williams CK, Shaffer MSP, Parkin IPet al., 2015, Dual-Mechanism Antimicrobial Polymer-ZnO Nanoparticle and Crystal Violet-Encapsulated Silicone, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 1367-1373, ISSN: 1616-301X

JOURNAL ARTICLE

Bakewell C, White AJP, Long NJ, Williams CKet al., 2015, Scandium and Yttrium Phosphasalen Complexes as Initiators for Ring-Opening Polymerization of Cyclic Esters, Inorganic Chemistry, Vol: 54, Pages: 2204-2212, ISSN: 1520-510X

JOURNAL ARTICLE

Chapman AM, Keyworth C, Kember MR, Lennox AJJ, Williams CKet al., 2015, Adding Value to Power Station Captured CO2: Tolerant Zn and Mg Homogeneous Catalysts for Polycarbonate Polyol Production, ACS Catalysis, Vol: 5, Pages: 1581-1588, ISSN: 2155-5435

JOURNAL ARTICLE

Paul S, Zhu Y, Romain C, Brooks R, Saini PK, Williams CKet al., 2015, Ring-opening copolymerization (ROCOP): synthesis and properties of polyesters and polycarbonates, CHEMICAL COMMUNICATIONS, Vol: 51, Pages: 6459-6479, ISSN: 1359-7345

JOURNAL ARTICLE

Giarola S, Romain C, Williams CK, Hallett JP, Shah Net al., 2015, Production of phthalic anhydride from biorenewables: process design, 12TH INTERNATIONAL SYMPOSIUM ON PROCESS SYSTEMS ENGINEERING AND 25TH EUROPEAN SYMPOSIUM ON COMPUTER AIDED PROCESS ENGINEERING, PT C, Vol: 37, Pages: 2561-2566, ISSN: 1570-7946

JOURNAL ARTICLE

Buchard A, North M, Kozak C, Remiezowicz E, Abrantes P, Bardow A, Dodson J, Williams C, Albo J, Ingram I, Carrera GVSM, Styring P, Poliakoff M, Lamb K, Quadrelli EA, MacDowell N, Dowson G, Aresta M, Heyn R, Castro-Osma JA, Webb W, Silva R, Marciniak A, Jones C, Yavuz CT, Capacchione C, Coogan A, Priestnall Met al., 2015, Atom efficiency in small molecule and macromolecule synthesis: general discussion, FARADAY DISCUSSIONS, Vol: 183, Pages: 97-123, ISSN: 1359-6640

JOURNAL ARTICLE

Winkler M, Romain C, Meier MAR, Williams CKet al., 2015, Renewable polycarbonates and polyesters from 1,4-cyclohexadiene, GREEN CHEMISTRY, Vol: 17, Pages: 300-306, ISSN: 1463-9262

JOURNAL ARTICLE

Romain C, Williams CK, 2015, Combining Sustainable Polymerization Routes for the Preparation of Polyesters, Polycarbonates, and Copolymers, Editors: Cheng, Gross, Smith, Publisher: AMER CHEMICAL SOC, Pages: 135-146, ISBN: 978-0-8412-3065-1

BOOK CHAPTER

Yi N, Unruangsri J, Shaw J, Williams CKet al., 2015, Carbon dioxide capture and utilization: using dinuclear catalysts to prepare polycarbonates, FARADAY DISCUSSIONS, Vol: 183, Pages: 67-82, ISSN: 1359-6640

JOURNAL ARTICLE

Saini PK, Romain C, Zhu Y, Williams CKet al., 2014, Di-magnesium and zinc catalysts for the copolymerization of phthalic anhydride and cyclohexene oxide, POLYMER CHEMISTRY, Vol: 5, Pages: 6068-6075, ISSN: 1759-9954

JOURNAL ARTICLE

Montrikittiphant T, Tang M, Lee K-Y, Williams CK, Bismarck Aet al., 2014, Bacterial Cellulose Nanopaper as Reinforcement for Polylactide Composites: Renewable Thermoplastic NanoPaPreg, MACROMOLECULAR RAPID COMMUNICATIONS, Vol: 35, Pages: 1640-1645, ISSN: 1022-1336

JOURNAL ARTICLE

Montrikittiphant T, Tang M, Lee KY, Williams CK, Bismarck Aet al., 2014, Macromol. Rapid commun. 19/2014., Macromol Rapid Commun, Vol: 35

Frontispiece: A Werkstoffverbund (laminated composite) manufacturing concept is used to produce high performance renewable bacterial cellulose (BC) nanopaper reinforced thermoplastic laminates. The mechanical performance of the resulting BC-reinforced thermoplastic laminates is found to be dependent on the tensile performance of the reinforcing BC nanopaper. Further details can be found in the article by T. Montrikittiphant, M. Tang, K.-Y. Lee,* C. K. Williams, and A. Bismarck* on page 1640.

JOURNAL ARTICLE

Bakewell C, White AJP, Long NJ, Williams CKet al., 2014, Metal-Size Influence in Iso-Selective Lactide Polymerization, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 53, Pages: 9226-9230, ISSN: 1433-7851

JOURNAL ARTICLE

Weiner J, Brown NJ, Shaffer MSP, Williams CKet al., 2014, Colloidal ZnO/Cu hybrid nanocatalysts for CO2 hydrogenation to methanol, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Williams CK, Bakewell C, Long N, Auffrant Aet al., 2014, Stereoblock polylactide: New, highly active, and iso-selective catalysts based on group 3/lanthanide phosphasalen complexes, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

Romain C, Williams CK, 2014, Chemoselective polymerization control: From mixed monomer feedstock to copolymers, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727

CONFERENCE PAPER

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